Limestone gas calciner

low-NOxalumina

Overview Gas suspension calciners (GSC) from FLSmidth are stationary flash calcination systems for thermal treatment of fine minerals. They provide direct process instrumentation, fuel flexibility and robust heat recovery to support efficient flash calcination of potash, phosphate, limestone, magnesite, gypsum, alumina, trona, clays, talc and similar materials.

Key benefits

• Easier to optimise and automate: stationary design allows direct instrumentation and straightforward DCS integration for improved control and visibility.
• Lower maintenance than rotating systems: reduced mechanical stress on refractory linings and no rotating-component alignment, extending lining life and reducing downtime.
• Optimised heat recovery reduces fuel consumption: off-gas and hot calcined solids transfer heat via multiple cyclone preheaters and cyclone coolers.
• Fuel flexibility reduces operating cost and emissions: supports solid, liquid and gaseous fuels and transitions to biomass, hydrogen or electrified heating.

Main features

• Proprietary flash calciner design to ensure solids entrainment, high heat transfer efficiency and mixing compatible with varied fuels.
• High-efficiency preheating and cooling cyclones for robust heat recuperation from off-gas and product streams.
• Proprietary refractory specifications to minimise surface heat loss and extend service life.
• Designed for full process automation with instrumentation and DCS-ready mechanical features.

Applications, capacities and mechanical design

• Typical feed materials: potash, phosphate, limestone, magnesite, gypsum, alumina, trona, clays, talc and other fine minerals.
• Capacity examples: custom engineered; documented units range from ~1 tph up to ~800 tph depending on application.
• Diameter range and mechanical options: sizes from ~1 m dia up to ~10 m dia; provisions for integral platforms, crane dismantling and pre-fitted refractory components to ease installation.
• Maintenance-minded design: stationary configuration reduces rotary wear; limited-diameter components can be supplied pre-lined.

Add-ons and optional systems

• Automation and control: DCS control packages for full automation.
• Fuel dosing circuits to support solid fuel or biomass firing.
• Gas treatment / off-gas treatment circuits for emissions control.
• SNCR for NOx reduction and secondary product cooling options.

Maintenance & services FLSmidth provides full lifecycle support including pilot and test trials, commissioning supervision, inspections, spare parts, retrofits, training and support for energy-conversion projects (hydrogen firing, oxyfuel, electrification).

Frequently asked questions (selected)

• What is a flash calciner? An industrial furnace for rapid thermal treatment of fine particles by suspending them in an upward flow of hot gases.
• How does a flash calciner work? It entrains fine particles in hot gas flow to achieve rapid heating and calcination; cyclone-based heat recovery enhances transfer and efficiency.
• What materials can a flash calciner process? GSCs can process clays, limestone, ores and other fine minerals; each unit is custom engineered for the application.

Technical specifications

• Manufacturer / brand: FLSmidth (FLS).
• Product family: Gas suspension calciner (GSC).
• Typical processing capacity: ~1 tph to ~800 tph (application dependent).
• Typical diameter range: ~1 m to ~10 m (site dependent).
• Heat recovery: multiple cyclone preheaters (off-gas) and cyclone coolers (product) to recuperate heat.
• Fuel capability: supports solid, liquid and gaseous fuels; adaptable to biomass, hydrogen and electrified heating.
• Automation: designed for instrumentation and DCS integration.
• Maintenance features: stationary design, integral access and pre-fitted refractory options.
• Emissions control options: off-gas treatment circuits and SNCR for NOx reduction.
• Typical applications: calcination of potash, phosphate, limestone, magnesite, gypsum, alumina, trona, clays, talc.